JPH05252318A - Method for calling by id card in public telephone set - Google Patents

Abstract

PURPOSE:To attain a call by an ID card even if cash or a telephone card for the charge of a call is not prepared by providing a fixed station in the vicinity of a public telephone set and judging whether the identification(ID) code of an ID card is registered or not whether the an electromagnetic field transmitted from the fixed station. CONSTITUTION:Reset pulse signals are repeatedly sent from a centralized fixed station management part 40 to fixed stations 11, 21, 31 in respective telephone boxes 13, 23, 33. Each fixed station allows a high frequency current to flow into its coil to form an electromagnetic field, and when a person having an ID card enters into the telephone box, a specific ID code is transmitted by means of electric energy induced by the coil built in the ID card. The ID code is detected, demodulated, amplified, and waveform-shaped by the fixed station and then inputted to a microcomputer to judge whether the ID code is registered or not. When the ID code is registered, a fixed station number is added to the ID code and outputted to the management part 40 and the inputted data are outputted to a control circuit 41 to control the corresponding telephone set 12, 22, or 32 to a call enabled state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention recognizes the data of an ID card carried by a public telephone box by utilizing a signal or an electromagnetic field transmitted from a fixed station installed therein. The present invention relates to a call method using an ID card of a public telephone set so that the telephone can be used.

[0002]

2. Description of the Related Art Conventionally, when calling from a public telephone, a telephone card is inserted or a coin is inserted, and in the case of a telephone card, it is determined whether there is a remaining frequency and the remaining frequency is displayed. Further, in the case of a coin, it is determined whether it is a legitimate one or not, and whether it is a denomination.

[0003]

However, each time a public telephone is used, a telephone card or coin is taken out from the pocket or bag and inserted or inserted into the telephone. After the call, the telephone card is removed. It had to be stored in the pocket or bag again, and the operation was troublesome. Moreover, if there is no telephone card or coins, there is a problem that the business may have to be interrupted on the way.

According to the present invention, when a person who carries an ID card enters a reception area of a fixed station such as a telephone box, I
It is an object of the present invention to provide a method of recognizing a D card and making a call without a telephone card or a coin.

[0005]

The present invention is a public telephone,
Or a fixed station is installed near it and a high frequency current is made to flow by a coil connected to this fixed station to form an electromagnetic field,
In the reception area of this electromagnetic field, the registered identification code in the ID card is read, and this is determined by the fixed station to see if it is registered. If it is registered, the telephone is controlled so that it can talk and the call ends. A call method using an ID card of a public telephone is characterized in that the call frequency and other necessary data are later transmitted to the fixed station centralized management unit.

[0006]

The reset pulse signal is repeatedly sent from the fixed station centralized control unit to the fixed stations in each telephone box. In the case where the ID card is a batteryless type, it is assumed that the fixed station forms a electromagnetic field by passing a high frequency current through its coil.
Here, when a person holding an ID card enters the telephone box, the ID card transmits a unique ID (identification) code by using electric energy induced in a coil incorporated in the card.

The identification code signal of the ID card is detected and demodulated by the fixed station, amplified and waveform-shaped, and input to the microcomputer. It is determined whether the identification code input by this microcomputer is registered. If you are registered,
The fixed station number is added and output to the fixed station centralized management unit.
The input data is converted into predetermined data and output to the control circuit to control the telephone in a call-enabled state. After the call is finished, necessary data such as ID code number and call frequency are output to the fixed station centralized management unit, and payment is made from a prepaid telephone bill or a fixed period is collectively billed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Figure 1 shows a fixed station installed in a telephone box,
FIG. 1 is an overall block diagram showing a relationship with an ID card carried by a user, showing a case where a plurality of fixed stations are centrally managed at one place.

In FIG. 1, telephone boxes 13 and 2 are provided.
Telephones 12, 22, 32, ... And fixed stations 11, 21, 31, ... Are installed in 3, 33 ,. These fixed stations 11, 21, 31, ...
0 input / output unit 42 is connected in parallel. The control circuit 41 in the central control unit 40 of the fixed station includes the telephone 1
, 22, 32, ... Are combined to control ON / OFF, collect call frequency, ID number, and other data.

Hereinafter, the ID card 10 (20, 30, ...)
The case of the battery-less system will be described. In this system, the ID card 10 (2) is generated based on the electromagnetic field generated by the coil of the fixed station 11 (21, 31, ...).
0, 30, ...), a voltage is induced in the built-in coil,
It transmits its own identification code with that power. The ID card 10 (20, 30, ...) Is based on FIG. 2, and the fixed station 11 (21, 31 ,.
It will be described in detail based on. In FIG. 3, the fixed station 1
Reference numeral 1 denotes a coil 59 that forms a high-frequency electromagnetic field in space, an LC resonance circuit 50 including the coil 59 and a capacitor, an envelope detection circuit 5 that extracts an envelope signal from a received signal.
1. An active filter circuit 52 that passes only a data signal, a comparator circuit 53 that converts the data signal into a binary digital signal, a microcomputer 54 that exchanges signals with the fixed station central management unit 40, and a high frequency signal is generated. An oscillation circuit 55, a switch circuit 56 that is turned on and off to output an oscillation signal at a constant time interval from the microcomputer 54, an amplification circuit 57 that amplifies a high frequency signal by voltage,
It comprises a booster circuit 58 for current amplification.

In FIG. 2, the ID card 10 comprises a coil 71 and a capacitor 72, an LC resonance circuit 60 which resonates with a high frequency electromagnetic field formed in the space by the coil 59 of the fixed station 11, and energy obtained by the resonance. Rectifier circuit 63 for converting to DC power for driving internal elements, clock extracting circuit 62 for extracting a clock synchronized with the resonance frequency, frequency dividing circuit 64 for dividing the frequency of the extracted clock, inside the frequency dividing circuit 64 Of the first clock generating circuit 65 for dividing the clock signal of 64 by 64, a second clock generating circuit 66 for dividing the clock signal of the first clock generating circuit 65 by 128, an inverter circuit 67, and identification code data unique to itself. A serial ROM 68 for memory, a switching element 69 such as an FET, and a capacitor 70 are provided. The frequency of both ends of the coil 59 of the fixed station 11 consists of a modulation circuit 61 for AM modulation by.

The operation of the above configuration will be described with reference to the waveform chart. (1) When the fixed station central control unit 40 is powered on, the switch circuit 56 is turned on and off by a signal from the microcomputer 54, and the reset pulse signals are sequentially transmitted to the fixed stations 11, 21, 31 in a time-division manner. Be done. For example, fixed station 11, ...
Assuming that there are three units, first, the fixed station 11
Reset pulse signal is sent to the fixed station 21
A reset pulse signal of 00 ms is sent, and then a reset pulse signal of 500 ms is sent to the fixed station 31. Then, it returns to the fixed station 11 again, a reset pulse signal of 500 ms is sent, and this is repeated thereafter.

(2) By the reset pulses A1, B1, and N1 from the fixed station centralized management unit 40, the fixed stations 11, 21, and
The coils 31 each generate a high-frequency electromagnetic field in the coil 59. In the following description, the exchange of signals between the fixed station 11 and the ID card 10 will be described. When the switch 56 is turned on as shown in FIG. 4A by the reset pulse from the microcomputer 54, the high frequency signal of the oscillation circuit 55 passes through the amplifier circuit 57 and the booster circuit 58 and then the LC resonance circuit 5
By 0, a high frequency electromagnetic field as shown in FIG. 4B is formed in the space.

(3) Here, it is assumed that the person carrying the ID card 10 enters the telephone box 13, that is, the space area of the high frequency electromagnetic field by the fixed station 11.
At this time, even if the ID card 10 is left in the pocket or the like, the electromagnetic field passes through the clothes through the inside and outside. Then, it resonates with the LC resonance circuit 60 of the ID card 10. The energy obtained by the resonance circuit 60 is converted into DC power by the rectifier circuit 63, and power is supplied to each element in the ID card 10, such as the frequency dividing circuit 64 and the serial ROM 68. The clock synchronized with the resonance frequency extracted by the clock extracting circuit 62 is sent to the frequency dividing circuit 64, and the clock divided by 64 of the first clock generating circuit 65 is sent to the serial ROM 68 via the inverter circuit 67. Fig. 4
The ID code data as shown in (c) is read. When all the ID code data are read, a signal divided by 128 is output from the second clock generation circuit 66 and reset.

A check digit is added to the identification code data as needed. This serial ROM6
FET of the modulation circuit 61 according to the identification code data from 8
69 is turned on and off to change the impedance, and the modulation circuit 61 performs AM modulation on the frequencies at both ends of the coil 59 of the fixed station 11. More specifically, in FIG. 5 showing an equivalent circuit of the fixed station 11 and the ID card 10, the coils 59 and 71 are provided even if the ID card 10 does not exist in the reception area of the fixed station 11 or even in the reception area.
When and are orthogonal and do not react, C0 of fixed station 11
And the resonance frequency f of L0 is , And the voltage V0 of the coil 59 is maximized when f = f0 is tuned. Normally, f0 = f is fixed. Here, the switch element 69 of the ID card 10
When is off, the resonance frequency f2 of the ID card 10 is And is tuned to f2 = f0. When the switch element 69 is on Becomes However, when the ID card 10 is in the reception area of the fixed station 11, f2 = f0 when the switch element 69 is off, so that the current i proportional to the strength of the electromagnetic field flows through the coil 71. If the switch element 69 is on, f2 ≠ f0, so the current i changes. This change in the current i is caused by the mutual induction action in L0 of the coil 59.
And the voltage V0 changes. That is, ID
It can be said that the card 10 is a modulator that performs AM (amplitude modulation) on the voltage shown in FIG. 4B of the coil 59 of the fixed station 11 as shown in FIG. 4D. The switch element 69 may be tuned to f2 = f0 when it is on, and may be f2 ≠ f0 when it is off.

(4) The change amount of the voltage changed as shown in FIG. 4 (d) is detected by the envelope detection circuit 51 as shown in FIG. 4 (e), and the active filter circuit 52 shown in FIG. f)
As shown in (4), only the necessary frequency component is extracted, converted into a binary value by the comparator circuit 53 as shown in FIG. The microcomputer 54 determines whether the input identification code data is registered.

(5) If registered, the fixed station number of the fixed station 11 is added to the identification code, and the microcomputer 54 outputs the signal A4 of FIG.

(6) Input / output unit 4 of fixed station centralized management unit 40
The data A4 input to 2 is output to the control circuit 41.

(7) The control signal from the control circuit 41 is used to control the telephone 12 so that the telephone 12 can talk. A person carrying the ID card 10 makes a call using the telephone 12. After the call is completed, when the receiver is placed, the telephone 12 sends the call frequency, the ID number and other data to the fixed station centralized management unit 40. Then, the call charge at this time is settled by the charge that has been delivered in advance, or billed collectively for every fixed period.

The above description is for the ID card 10 and the fixed station 1.
I explained the relationship with 1, but ID cards 10, 2
The same applies to the mutual relationship between 0, 30, ... And the fixed stations 11, 21, 31 ,.

In the above-mentioned embodiment, the fixed stations 11, ... Are installed in the telephone boxes 13 ,. However, as long as reception areas from a plurality of fixed stations do not enter each other, a telephone without a telephone box can be used. Can be installed. In the above embodiment, in the case of the batteryless system, that is, the fixed station 11
The case where the high frequency electromagnetic field of 1 is resonated in the ID card 10 and the voltage induced at that time is used as the internal drive power has been described. However, the ID card 10 is not limited to this example, and may be a battery built-in type. In this case, the ID card receives a transmission request signal transmitted from a fixed station by a transmission coil instead of the mutual induction method. When it is received by the coil, it is ASK-modulated with the identification code data from the ID card and sent back to the fixed station by the transmission coil. After receiving this by the reception coil of the fixed station, it is demodulated to determine whether it is registered or not. May be. If it is registered, the telephone is controlled so that it can talk.

[0022]

As described above, according to the present invention, a person who carries an ID card can enter an ID even if he / she does not have a call charge or a telephone card if he / she enters the receiving area of a fixed station such as a telephone box. The card can be recognized by the fixed station in a contactless manner and can be used for telephone calls. Therefore, not only is there no troublesome operation during a call, the call is not interrupted on the way, and a battery-less ID card can be used, which eliminates the need for battery replacement. Have an effect.

[Brief description of drawings]

FIG. 1 is an overall block diagram for performing the method of the present invention.

FIG. 2 is an electric circuit diagram of an ID card for carrying out the method of the present invention.

FIG. 3 is an electric circuit diagram of a fixed station for carrying out the method of the present invention.

FIG. 4 is an output waveform diagram of each unit in FIGS. 2 and 3.

FIG. 5 is an equivalent circuit diagram of a fixed station and an ID card.

[Explanation of symbols]

10, 20, 30, ... ID card, 11, 21, 31,
… Stations, 12, 22, 32,… Telephones, 13, 23,
33, ... Telephone box, 40 ... Central office of fixed station, 41
... control circuit, 42 ... input / output section, 50 ... LC resonance circuit, 5
1 ... Envelope detection circuit, 52 ... Active filter circuit,
53 ... Comparator circuit, 54 ... Microcomputer, 55 ... Oscillation circuit, 56 ... Switch circuit, 57 ... Amplification circuit, 58 ... Booster circuit, 59 ... Coil, 60 ... LC resonance circuit, 61
... modulation circuit, 62 ... clock extraction circuit, 63 ... rectification circuit, 64 ... frequency division circuit, 65 ... first clock generation circuit,
66 ... Second clock generating circuit, 67 ... Inverter circuit, 68 ... Serial ROM, 69 ... Switch element, 70
… Capacitor, 71… Coil, 72… Capacitor.

Claims (3)

[Claims] 1. A fixed station is installed at or near a public telephone, a high-frequency current is passed by a coil connected to the fixed station to form an electromagnetic field, and an ID card in the reception area of this electromagnetic field The registered identification code is read, this is used by the fixed station to determine whether it is registered, and if it is registered, the telephone is controlled so that it can talk. After the call ends, the call frequency and other necessary data are centralized in the fixed station. A call method using an ID card of a public telephone, characterized in that the call is transmitted to the management unit. 2. An ID card receives a transmission request signal transmitted from a public telephone or a fixed station installed near the public telephone, and transmits a unique identification code from this ID card.
The fixed station judges whether or not it is registered, and if it is registered, it controls the telephone so that it can talk, and after the call ends, the call frequency and other necessary data are sent to the fixed station centralized management unit. ID of public telephone characterized by
How to call by card. 3. A call method using an ID card of a public telephone according to claim 1, wherein a plurality of fixed stations are connected to a fixed station centralized management unit in parallel with each other, and each fixed station is sequentially controlled by time division.